RISE Science Grade 8 Practice Questions - RISE Science - Grade 8 Exam

Access More Questions

A block of solid dry ice (carbon dioxide) is placed on a table at room temperature. White foggy gas immediately begins billowing off the block, and after one hour no solid remains. Which statement correctly describes this event?

It is a chemical reaction because a new gas substance with different properties was created. It is a physical change (sublimation) because the carbon dioxide molecules changed state without breaking chemical bonds. It is a chemical change because carbon dioxide atoms disappeared permanently. It is a physical change because the total mass of the room decreased.

Correct Answer:

It is a physical change (sublimation) because the carbon dioxide molecules changed state without breaking chemical bonds.

Access more questions from this quiz

Continue to RISE Science Grade 8 Practice Questions - RISE Science - Grade 8 Exam for more practice questions and the full quiz experience.

Access More Questions